Update setup.py file to flag compatibility with Python 2.7-3.4-3.5-3.6 (#57)

Author: DEKHTIARJonathan

setup.py

@@ -99,6 +99,12 @@ def __len__(self):
         'Operating System :: POSIX',
         'Operating System :: Unix',
         'Programming Language :: Python',
+        'Programming Language :: Python :: 2',
+        'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
         'Programming Language :: C++',
         'Programming Language :: Python :: Implementation :: CPython',
         'Topic :: Scientific/Engineering',